Printing press



Aug. 4, 1936. E. o. vANDERcooK ET AL.

PRINTING PRESS 3 Sheets-Sheet l Filed Aug. l2, 1935 I) .I x IIMPI- WN [We Aug- 4, 1936- E. o. vANDERcooK ET Al. 2v,049,635

` PRINTING PRESS 5 Sheets-Sheet 2 Filed Aug. 12, A1935 unllunlll NN n@ N @N L Si il@ n@ v\\\ v Q. L@ WN, X: MN .KN Qv Mh Nm.. Mh. |rtH .vi .Q w ||l N QM. mvv' NN: N @Mx I l l l I l l l I l l I l l l mi v v m ug- 4, 1936 E. o. vANDERcooK ET AL 2,049,635

PRINTING PRESS Filed Aug. 12, 1935 3 Sheets-Sheet 3 Wanda roc0/.

Patented Aug. 4, 1936 PTENT OFFICE PRINTING PRESS Edward 0. Vanderoook and David D. Vandercook, Evanston, and Raymond L. Pelland, Chicago, lill., assgnors to Vandercock & Sons, Chicago, lll., a, corporation of Illinois Application August 12, 1935,:SerialNo.v 35,758

8 Claims.

Our invention relates to printing presses, particularly proof presses, and involves several features of construction, arrangement and operation.

One of the important objects is to provide an arrangement in which a supporting and driving means for frisket sheets is mounted entirely on the impression roll or cylinder carriage to move bodily therewith and to guide a frisket sheet around the roll during relative movement between the roll and the printing form.

A further object is to provide frisket sheet supporting means in the form of belts looping around the impression roll at the ends thereof and around guide pulleys supported on the roll carriage, with crossl members connecting the belts between which the frisket sheet is stretched and with the belts relieving the sheet of driving strain as the sheet is carried by the belts around the roll during printing operation.

A further feature of the invention is the arrangement of the impression roll driven belts in upright position so that the frisket supported thereby is 'normally in substantially a vertical plane and tangential with the inner side of the roll. This arrangement is of considerable importance and utility in connection with power driven presses as the press attendant may stand at the end of the press in front of the roll and frisket sheet to feed in the sheet to be printed and to receive the printed sheets as they are returned to the feed plate. Where a number of colors are to be applied to each sheet a number of presses, depending upon `the number of colors, may be arranged side by side in a row with an attendant at the front end of each press, and as a sheet is printed with one color theV attendant receivesl it and passes it to the attendant at the next press for running through the next press for the next color and so on until all the colors have been applied, there being thus no wasted movement or time and proof printing may be accurately and quickly accomplished.

The above enumerated `and other features of the invention are incorporated in the structure shown on the drawings, in which drawings Figure 1 is a side elevation of a press show- .ing the frisket supporting and driving means l therefor;

Figure 2 is a front elevation with the press bed in cross-section; p v

Figure 3 is an enlarged front View of the frisket supporting chain belts and cross members and a frisket sheet applied thereto;

Figure 4 is a section on plane IV-IV of Fig- `ure 3;v

of the Vcylinder bearing frames I3 and'ld.

(Cl. 10i-269) Figure 5 Vis a section onrplane V-V of Figure '3; and

rolling engagement with, the rails I6 along the sides of the bed and the vgears Il on the cylinder structure engage the gear racks I8 along the sides of the bed.

Suitable means maybe provided for reciprocating the carriage on the printing bed. As shown, a shaft I9 extending across the base II below the bed supports gears 29 meshing with rack bars 2l on thebase, and gears 22 on the 20 shaft mesh with rack bars 23 on the under sides A connecting rod structure 24 extends from the shaft 29 and by means of suitable mechanism (not shown) this connecting rod is reciprocated 25 for back and forth movement of the shaft I9 and consequently back and forth travel of the cylinder carriage structure. As the carriage reciprocates the impression cylinder I5 will be rotated for printing cooperation with a printing 30 form F supported on the bed I0, in the Wellknown manner. o

Brackets 25-25 mounted on the carriage bearing frames I3 and I4 supportvertical bars yor posts 26 and 26' spaced and secured at their 35 upper ends by a bar 2l. Adjacent to the posts,` levers '28 and 28 are pivoted on the bar v2'I and kat their front ends journal'sprocket,pinions 29 Vand 29 respectively for receiving and supporting chain belts 3B and 3D. The sprocket pinions are in vertical alignment with sprocket gears 3l and 3| on the cylinder I5 adjacent the :Vends thereof and concentric therewith so that as the cylinder rotates the chains will be driven. At anintermediate point on the posts 26-26 brackets 32 and 32 journal idler sprocket pin- Tension springs 3ft-313 anchored at their mwen-5o d ends to the posts 26-26' connect with the rear ends of the levers 28-28 which journal the upper sprocket pinions so that yielding pull is exerted on the chain belts to keep them taut at al1 times.

front bar is riveted at its ends to angle pieces 36 and 3G secured to the chain belts 3U and 30' respectively. Such securing may be readily accomplished by removing two of the ordinary link pins and inserting longer pins by which the angle pieces may be secured.

The bar 35 has a longitudinally extending groove or channel 31 for receiving a longitudinally extending tongue 38 on a rear lower bar 39. The lower end of a frisket sheet S is received between the bars 35 and 39 to be firmly clamped between the bars as by means of screws '40 extending through the bar 39 and having threaded engagement with the bar 35, and these screws may have enlarged knurled heads 4| so that they may be readily manipulated. The sheet will be firmly pressed into the groove 31 by the tongue 38 when the bars are clamped together and the sheet will be thus rigidly held against displacement. We have shown three clamping screws 40, the outer'screws being outside of the side edges of the frisket sheet while an intermediate screw 40 extends through a hole provided in the lower end of the frisket sheet, such hole serving to accurately align the sheet vertically when it is mounted on its support.

For the upper frisket supporting bar structure angle pieces 42 and 42 are secured to the belts 3D and 30 anda front bar 43 is riveted to the angle'pieces and has in its upper side the longitudinally extending V-shaped channel 44. The upper bar has on its lower side a longitudinally extending V-shaped tongue 46, the frisket sheet at its upper end extending between the bars 43 and 45 to be securely held in the channel 44V by the tongue 46. For drawing the bars together to clamp the sheet, screws 41 'extend through the upper bar 45 rand have threaded engagement in the lower bar 43, these screws being provided with knurled heads 48 for easy manipulation thereof. The screws are located at the ends of the bars outside of the side edges of the frisket sheetv and in order to hold the bars apart so that the frisket sheet may be readily inserted the bars have complementary recesses ,49 and 50 for receiving compression springs 5i. When the screws 48 are loosened the springs will raise the upper bar 45 for ready withdrawal or insertion of a frisket sheet.

The frisket sheet is first applied to the lower bar structure and properly aligned relative lthereto by the intermediate screw 4' receiving the aligning hole in the lower end of the sheet.

The upper end of the sheet is then inserted between the bars 43 and 45 of the upper bar struc- `ture and as the screws 48 are tightened the upper end of the sheet will be drawn down into `will be stretched in accurate position. 70

the channel 44 by the tongue 46 and the sheet The springs 34 and 34 are of suflicient strength to keep the links ofthe chain belts taut at all times ,and to prevent any contraction of the belts be- 1 tween the upper and lower bar structures when the frisket sheet is applied. During travelof the frisket sheet around the impressionY cylinder it will therefore never be subjected to any driving strain as all such strain will be taken up by cylinder is rotated for the travel of the fed-in sheet therewith. At the same time the frisket supporting belts are driven by their sprocket engagement with the cylinder structure and the fed-in sheet is met by the downwardly shifted frisket and both travel together around the cylinder to be then carried thereby across the printing form FV for printing of the sheet. During the return stroke of the cylinder carriage the printed sheet and frisket are returned, the printed sheet traveling upwardly with the frisket by the air pressure against the sheet during forward travel of the carriage and also by static electrical attraction and then,v as the carriage comes to rest, the printed sheet will be caused by inertia to fall forwardly onto the feed table 52' or it may be withdrawn manually from the frisket. The improved arrangement shown and described in which the frisket sheet and its supporting structure are entirely mounted on the cylinder carriage and driven and controlled by the cylinder, and the support of the frisket sheet in a substantially vertical plane tangential with the rear side of the cylinder, makes it possible to more efficiently operate the press from the end thereof in front of the cylinder, as with such end feed the sheet to be printed can be more quickly and accurately fed to the cylinder and the printed sheet will be returned to the feed table by the frisket.

Our improved arrangement is therefore of great advantage in connection with proof presses where a number of colors are to be printed and where rapidity of application of the several colors is an essential factor. With our improved frisket arrangement a number of proof presses may be arranged in a row side by side as illustrated in Figure 6, with an operator at the end of each press in front of the cylinder thereof. The operator of the first press will feed a sheet for Vprinting of one color thereon and when the printed sheet is delivered back to the feed table the operator will hand it or shift it over to the operator of the next press for printing of the next color, and so on until all the colors have been applied. As the operators may stand at the ends of the respective presses to receive the printed sheet automatically returned to them after a printing operation, no time is lost and a proof operation involving several colors may be quickly and accurately accomplished.

The positive drive of the frisket supporting chain belts by the cylinder and the relieving of the frisket of any driving strain will assure proper alignment and travel at all times of the frisket and accurate work is assured.

We have shown a practical and efficient embodiment of the various features of our invention but we do not desire to be limited to the exact structures, arrangement and operation shown and described as changes and modifications may be made without departing from the scope of the invention.

We claim as our invention:

1. In a printing press, an impression cylinder and a traveling carriage therefor, a reciprocating frisket carrier mounted entirely on said cylinder carriage, and drive means for said frisket carrier controlled by said cylinder. s

2. In a printing press, an impression cylinder and a supporting carriage therefor, movable frisket supporting means mounted entirely on said carriage for bodily travel therewith, and drive means for said frisket supp-ort controlled solely by said cylinder.

3. In combination with a printing press comprising a printing form support and a support with a rotatable impression cylinder journaled thereon, said supports being relatively movable, of arms extending upwardly on the cylinder sup'- port adjacent to the ends of the cylinder, a pair of chain belts and sprocket wheels at the upper ends of said arms for receiving and supporting said belts, sprocket teetharound said cylinder at the ends thereof for receiving the respective chain belts and whereby said belts are driven when said cylinder is rotated during a printing operation, and cross members on said chain belts for holding a frisket sheet in position to be carried around the cylinder into printing alignment 'with the printing form during relative movement of said supports.

4. In a printing press, the combination with the impression cylinder and its reciprocating supporting carriage, of arms extending upwardly from said carriage adjacent to the ends of the cylinder, belt supporting and guiding members on said arms above the cylinder, belts receiving said members and looping around said cylinder adjacent the respective ends thereof whereby said belts will be driven when said cylinder is rotated, and means on said belts for supporting a frisket sheet to be carried by said belts around said cylinder when said cylinder is rotated for a printing operation.

5. In a printing press, a printing bed and a carriage reciprocable thereon and journaling a rotatable impression cylinder, frisket supporting means mounted entirely on said carriage for supporting a frisket sheet normally inupright position tangential with the inner side of said cylinder and arranged to be drivenupon rotation of said cylinder to carry the frisket sheet around the cylinder during the printing operation.

6. In a printing press, a printing bed and a carriage reciprocable thereon and journaling an impression cylinder, a vertical frisket carrying frame entirely mounted on said carriage to travel therewith and to normally hold a frisket sheet in a substantially vertical plane tangential with the inner side of the cylinder and arranged to be driven by the rotation of the cylinder to carry the sheet around the cylinder during a printing operation.

7. In combination With a printing press comprising a printing form support and a support With a rotatable impression cylinder journaled thereon, said supports being relatively movable, of arms extending upwardly on the cylinder support adjacent to the ends oi the cylinder, a pair of chain belts and sprocket Wheels at the upper ends of said arms for receiving and supporting said belts, sprocket teeth around said cylinder at the ends thereof for receiving the respective chain belts and whereby said belts are driven when said cylinder is rotated during a printing operation, and cross members on said chain belts for holding a frisket sheet in position to be carried around the cylinder into printing alignment with the printing form during relative movement of said supports, levers supporting said sprocket wheels, and yielding means acting on said levers tending to hold said sprockets for tensing said belts.

8. In proof printing, the arrangement involving a plurality of proof presses arranged side by side in a row, each press comprising a printing bed and a carriage reciprocable thereon and journaling an impression cylinder, frisket carrying means mounted on the carriage of each press to hold a frisket normally in a substantially vertical plane tangential with the inner side of the cylinder, and a feed table in front of the cylinder over which sheets to be printed may be guided over the top of the cylinder for reception between the cylinder and the frisket, said frisket carrying means being arranged to be driven upon rotation of the cylinder to carry the frisket and a fed-in sheet around the cylinder for a printing operation and to return the printed sheet to the feed table in front of the cylinder after a printing operation, whereby said presses may be operated by attendants standing at the ends thereof for rapid transit of printed sheets from one press attendant to the others.

EDWARD O. VANDERCOOK. DAVID D. VANDERCOOK. RAYMOND L. PELLAND. 

